MATERIALS | HIGH TEMPERATURE PLASTICS
highest class possible according to the standard. This makes it highly tracking-resistant, which reduces the risk of short circuits and defects caused by creepage currents and caters to the growing need for miniaturised connectors. “But it can also be used at voltages higher than
600 V,” says Helbich. “The connector design for direct current systems can be optimised for up to 1,500 V in accordance with the design guidelines of the standard IEC 60664 / VDE 0110-1.” The tracking resistance of the compound also hardly diminishes after long-term thermal aging at 120°C or after climate testing. Compounds producer Eurotec Engineering
Above: Bus bar holders made of BASF’s Elastollan R 2600 FHF TPU material, which has an
optimised thermal linear expansion coefficient
standard engineering plastics, Elastollan R 2600 FHF stands out due to its optimised thermal linear expansion coefficient, which is close to copper and comparable conductor materials. This reduces the risk of cracks occurring during temperature changes which increases the safety standard. Elastollan TPU is a halogen-free flame-retardant
Right: High- voltage
connectors are a target application for the new Lanxess Pocan BFN HR PBT material
material achieving the UL94 V-0 classification. BASF says: “In addition to the main aspect of thermal linear expansion, the TPU also has three convincing advantages compared to materials such as polyphenylene sulphide (PPS). It can be processed at lower temperatures, has a lower density and, due to its white colour, can be easily coloured even with bright pigments.” BASF’s support for customers includes pre-pro- duction design simulation for bus bar holders. “Like several other Elastollan grades, the new Elastollan can be simulated by our Ultrasim tool,” it says. Lanxess HPM has launched the Pocan BFN HR
range of polybutylene terephthalate (PBT) materials with a compound for e-mobility electrical connectors that is halogen-free flame-retardant (UL94 V-0 classifica- tion) and hydrolysis-stabilised. “One strength of the structural material is that its outstanding electrical properties are hardly dependent on temperature and moisture in the typical operating conditions of high-voltage connec- tors. It can be used at temperatures of up to 150°C,” says Bernhard Helbich, Technical Market- ing Manager Key Accounts at Lanxess. The new PBT compound is characterised by a high level of volume resistance and dielectric strength. The latter is well over 30 kV per mm at temperatures of up to 140°C (IEC 62431-1). In the CTI test, the material achieves CTI A 600, the
20 INJECTION WORLD | September 2022
Compounds has a wide range of PPA, PPS and PEEK materials for high temperature applications. For EV parts exposed to high stress and high temperatures, its injection moulding materials include Tecotek ES20 GR30 NL (a PESU compound which is 30% glass fibre reinforced in natural colour) and Tecotek EP20 GR20 NL (as the previous compound but 20% glass fibre reinforced). These can be used for rotor end caps due to their dimensional stability. Other compounds are Tecotron XS20 KK65 BK009 0B (PPS, 65% glass fibre/mineral reinforced, black), Tecotron XS20 GR40 BK009 (PPS, 40% glass fibre reinforced, black), Tecomid NT40 GD40 BK009 XA61 (PPA, 40% glass fibre reinforced, flame retardant and heat stabilised) and Tecomid NT40 GR30 BK009 XA61 (as the previous compound but 20% glass fibre reinforced), which are used for brush holders of e-motors. Eurotec highlights Tecotron XS20 KK65 BK009 0B for insulation coil applications due to its thermal conductiv- ity and dimensional stability. In conventional cars, a continu-
ing trend is to achieve more power from smaller engines which work at higher temperatures. Plastics in these applica- tions need to retain mechanical proper- ties at elevated temperatures. Eurotec’s Tecomid HT and Tecotron compounds can
provide continuous use temperatures (CUT) up to 180°C and 210°C. For example, Tecomid NT40 GD40 BK009 XA61 (PPA, 40% glass fibre rein- forced, flame retardant and heat stabilised) was approved by an automotive OEM for a new generation of an inverter housing where PBT and PET materials cannot provide the required CUT. In the aviation and aerospace industry, high performance polymers are used which inherently exhibit flame retardant behaviour, which allows
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IMAGE: LANXESS
IMAGE: BASF
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